非离子表面活性剂修饰纳米钛柱撑粘土材料的合成与应用  

Synthesis and Application of Hydrophobic TiO_2 Pillared Clay Modified by Non-ionic Surfactant

作　　者：安太成[1] 丁雪军[1,2] 陈江耀[1,2] 李桂英[1] 陈嘉鑫[1,2] 傅家谟[1] 盛国英[1] 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室广东省环境资源利用与保护重点实验室,广州510640 [2]中国科学院研究生院,北京100049

出　　处：《矿物岩石地球化学通报》2011年第1期53-58,共6页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(40302013,40572173和40632012)

摘　　要：本文采用非离子表面活性剂聚乙烯醇(PVA)对粘土进行改性修饰,并以钛酸丁酯和盐酸分别为前驱物和酸催化剂,采用溶胶-凝胶法制备了PVA修饰疏水型纳米钛柱撑粘土材料,对其进行了比表面积(BET)、热重分析(TGA)、X射线粉末衍射(XRD)和扫描电子显微镜(SEM)表征。实验结果表明,TiO2成功地插入了粘土层间,并以锐钛矿型的晶型存在,制备的柱撑粘土复合材料仍有较好的层状结构,其比表面积较原土有明显的增加,经过PVA修饰后柱撑粘土表面的疏水性得到了提高。以甲基橙的吸附和降解为模型反应,考察了柱撑粘土的吸附性能和光催化活性,实验结果发现PVA修饰疏水型纳米钛柱撑粘土材料对甲基橙表现出了良好的吸附能力和较好的光催化活性。The surfactant modified TiO2 pillared clay was prepared by sol-gel method at certain ratio of tetra-n-butyl titanium to hydrochloric acid modified by non-ionic surfactant polyvinyl alcohol（PVA）.Thermal gravity analysis（TGA）,X-ray diffraction（XRD） and Scanning electron microscopy（SEM） were used to investigate the texture of the prepared catalyst,and its BET surface area was also measured.The results indicated that PVA-modified TiO2 pillared clay was well pillared by the anatase TiO2 and the BET surface area was enhanced substantially.The surface of PVA-modified TiO2 pillared clay became more hydrophobic after modified by PVA.The adsorption and photocatalytic performance of PVA-modified TiO2 pillared clay were also studied by using methyl orange as model organic pollutant.It was found that PVA-modified TiO2 pillared clay showed excellent adsorption ability and moderate photocatalytic activity to methyl orange.About 41% and 53% of methyl orange were adsorbed and degraded by the PVA-modified TiO2 pillared clay catalyst within 40min.

关 键 词：柱撑粘土 非离子表面活性剂 吸附 光催化 甲基橙 

分 类 号：TB383.1[一般工业技术—材料科学与工程]